TiCp/W复合材料热冲击损伤行为的数值模拟

为了揭示TiC颗粒增强的钨基复合材料（TiCp/W)高温下的失效规律，采用有限元方法从宏观和微观两个方面对该复合材料在氧乙炔冲击中的损伤行为进行了数值模拟，模拟结果表明，复合材料试样宏观损伤行为是裂纹在试样周边萌生，沿径向向心部扩展，微结构损伤行为是微裂纹在TiCp/W界面附近产生，而生在基体中扩展，TiC颗粒含量越高，复合材料超易损伤。TiC颗粒没有阻止裂纹扩展的作用，在基体中增加TiC反而会降低材料的抗热冲击性能。复合材料非稳态温度场的模拟结果，材料的宏观与微观损伤行为的模拟结果都与实验结果吻合。

Numerical simulation of thermal shock damage behavior of TiCp/W composites

In order to promote the high temperature application of tungsten matrix composites reinforced by TiC particles (TiC p/W), two finite element models based on the macro shape of the specimen and the microstructure of the composites, were proposed to simulate the damage behavior during the shock process caused by an oxyacetylene flame. The macro damage simulation mode of TiC p/W composites shows that the crack initiates in the edge of the specimen and then propagates to the center zone. The micro damage mode of the microstructure shows that the crack initiates near TiC p/W interface and propagates in the tungsten matrix. The composites with high TiC contents are easily damaged by thermal shock. The TiC particles can not prevent the crack propagation in the tungsten matrix, and inversely, decreases the thermal shock resistance of the composites. The calculated results of the temperature curves of the heated surface and back surface of the specimens, and the macro and micro damage modes all agree well with the experimental results.